www.DataSheet4U.com
19-1084; Rev 0; 11/07
Automotive Contact Monitor and Level Shifters with LDO Regulator
General Description
The MAX13037/MAX13038 automotive contact monitor and level shifters monitor and debounce eight remote mechanical switches and assert an interrupt (INT) if a switch changes state. The state of each switch is sampled through an SPI™ interface by reading the status register. Any switch can be prohibited from asserting an interrupt by writing to the command register. Four of the switch inputs are intended for ground-connected switches (IN0–IN3) and the other four inputs (IN4–IN7) are programmable in groups of two for either groundconnected or battery-connected switches. Two switch inputs (IN0, IN1) have direct level-shifted outputs (DO0, DO1) to be used for PWM or other timing-based signals. Switch input thresholds are set to 50% of the voltage applied to BATREF. The threshold hysteresis is set by connecting an external resistor from HYST to ground. The MAX13037/MAX13038 supply an adjustable wetting current to each closed switch to clean mechanical switch contacts that are exposed to adverse conditions. The MAX13037/MAX13038 feature a low dropout (LDO) linear regulator capable of supplying up to 150mA of current. The MAX13037 LDO has an output voltage of +5V, whereas the MAX13038 has an output voltage of +3.3V. The MAX13037/MAX13038 also feature a watchdog timer and an open-drain reset output with adjustable timing. The MAX13037/MAX13038 operate with a +6V to +26V battery voltage applied to BAT. The MAX13037/ MAX13038 are available in a 6mm x 6mm, 36-pin TQFN package and operate over the automotive -40°C to +125°C temperature range. o +42V Compatibility on BAT o Switch Inputs Withstand Reverse Battery o 150mA LDO, +5V (MAX13037) or +3.3V (MAX13038) o Ultra-Low Operating Current 28µA (typ) in 64ms Scan Mode with LDO ON o Resistor Adjustable Switching Hysteresis o Watchdog and Reset o Built-In Switch Debouncing o Interrupt Output o Immunity to Transients o High Modularity o Thermal Protection o ±8kV HBM ESD Protection on IN0–IN7 Without External Components o Two Inputs (IN0, IN1) Programmable as Direct Outputs o Four Inputs (IN4–IN7) Programmable for BAT or GND Related Switches
Features
o +6V to +26V Operating Voltage Range
MAX13037/MAX13038
Applications
Body Computers Window Lifters Seat Movers Electric Sunroofs Other Control ECUs
MAX13038ATX+ MAX13037ATX+ PART
Ordering Information
LDO TEMP OUTPUT RANGE VOLTAGE +5V -40°C to +125°C -40°C to +125°C PINPACKAGE PKG CODE
36 TQFN-EP* (6mm x T3666-3 6mm) 36 TQFN-EP* (6mm x T3666-3 6mm)
+3.3V
SPI is a trademark of Motorola, Inc.
+Denotes a lead-free package. *EP = Exposed paddle.
Pin Configuration and Typical Application Circuit at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
www.DataSheet4U.com
Automotive Contact Monitor and Level Shifters with LDO Regulator MAX13037/MAX13038
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.) VLO ........................................................................-0.3V to +6.0V BAT.........................................................................-0.3V to +42V IN_ , BATREF...........................................................-45V to +45V IN_ to BAT ...............................................................-45V to +45V SD, REGON. ...........................................................-0.3V to +45V HYST, WET, TD, TDEB, THRESH, OT, INT, RST......-0.3V to 6.0V CS, CLK, SDI, SDO, WDI, DO0, DO1, REGOFF.......................................-0.3V to (VLO + 0.3V) Continuous Current (CS, CLK, SDI, SDO, WDI, DO0, DO1, REGOFF) .............................................................±20mA Continuous Power Dissipation (TA = +70°C) 36-Pin TQFN (derate 35.7mW/°C above +70°C) .......2857mW Junction-to-Case Thermal Resistance (θJC) (Note 1) 36-Pin TQFN .............................................................. 1.4°C/W Junction-to-Ambient Thermal Resistance (θJA) (Note 1) 36-Pin TQFN ............................................................... 28°C/W Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer board. For detailed information on package thermal considerations see www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(BAT = +6V to +26V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V, TA = +25°C.) (Note 2)
PARAMETER POWER SUPPLY BAT Supply Range VBAT VBAT = +14V, continuous scan (SC2 = 1, SC1 = 1, SC0 = 0), programmable hysteresis off (M0 = M1 = 1), IN0–IN7 = unconnected, regulator on (REGON = REGOFF = GND). VBAT = +14V, continuous scan (SC2 = 1, SC1 = 1, SC0 = 0), programmable hysteresis off (M0 = M1 = 1), IN0–IN7 = unconnected, regulator off (REGON = BAT, REGOFF = GND). 6 26 V SYMBOL CONDITIONS MIN TYP MAX UNITS
BAT Supply Current with Regulator On
ISUP_REG
57
110
µA
BAT Supply Current with Regulator Off
ISUP
46
80
µA
BAT Supply Current in Scan Mode with Regulator On BAT Supply Current in Scan Mode with Regulator Off BAT Supply Current in Shutdown Mode BATREF Input Resistance BATREF Input Leakage Current in Shutdown
VBAT = +14V, scan mode (SC0 = 0, ISCAN_REG SC1 = 0, SC2 = 0), regulator on (REGON = REGOFF = GND). ISCAN VBAT = +14V, scan mode (SC0 = 0, SC1 = 0, SC2 = 0), regulator off (REGON = BAT, REGOFF = GND). VSD = 0V, VBAT = +14V, REGON = BAT VBATREF = +14V VSD = 0V, VBATREF = +14V TA = +25°C TA = +125°C 1
28
48
µA
17 3 4 2.7
35 5 7
µA
ISHDN RBATREF IL_BATREF
µA MΩ
1
µA
2
_______________________________________________________________________________________
www.DataSheet4U.com
Automotive Contact Monitor and Level Shifters with LDO Regulator
ELECTRICAL CHARACTERISTICS (continued)
(BAT = +6V to +26V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V, TA = +25°C.) (Note 2)
PARAMETER SWITCH INPUTS (IN0–IN7) Input Voltage Threshold Center (Note 3) RHYST = ∞ or programmable hysteresis disabled RHYST = 90kΩ RHYST = ∞ or programmable hysteresis disabled Input Voltage Threshold Hysteresis (Note 4) VTH_HYS RHYST = 90kΩ RHYST = 0Ω Switch-State Sense Resistor Wetting Current Rise/Fall Time (Note 5) Wetting Current IN0–IN7 Input Impedance in Shutdown ESD Protection IN0–IN7 SDO, DO1, DO2 Output Voltage High SDO, DO1, DO2 Output Voltage Low INT, OT, RST Output Voltage Low SD Input Leakage Current SD, REGON Input Voltage Low SD, REGON Input Voltage High REGON Pullup Current CS, CLK, SDI, REGOFF, WDI Input Voltage Low CS, CLK, SDI, REGOFF, WDI Input Voltage High CS, CLK, WDI, REGOFF Input Leakage Current INT, OT, RST Leakage Current SDI Pulldown Resistor RSENSE IWET_RISE_
FALL
MAX13037/MAX13038
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VTH_C
0.425 x 0.5 x 0.575 x VBATREF VBATREF VBATREF 0.5 x 0.63 x VBATREF VBATREF VBATREF 0.133 x 0.166 x 0.22 x VBATREF VBATREF VBATREF 0. 26 x 0.361 x 0. 48 x VBATREF VBATREF VBATREF 0.5 x VBATREF 11 16 6 1 22 28 40 7.5 5.5 8.5 8 51 22 0.4 x
V
V
kΩ µs
RWET = 61kΩ RWET = 61kΩ
Rise Fall
IWET
RWET = 30kΩ RWET = 330kΩ VSD = 0V, VIN_ = +14V Human Body Model (HBM)
mA
MΩ kV
LOGIC-LEVELS (CS, CLK, SDI , SDI, DO0, DO1, INT, OT, RST, SD, REGON, REGOFF) VOH VOL VINTL IL_SD VIL_SD VIH_SD IREGON VIL VIH IIL IOL RSDI 0.66 x VLO -1 -1 65 100 +1 +1 145 REGON = 0 2.4 0.4 1 3.0 0.33 x VLO Source current = 2mA Sink current = 4mA Sink current = 4mA VSD = VBAT = +14V 0.8 x VLO 0.2 x VLO 0.4 1 0.8 V V V µA V V µA V V µA µA kΩ
_______________________________________________________________________________________
3
www.DataSheet4U.com
Automotive Contact Monitor and Level Shifters with LDO Regulator MAX13037/MAX13038
ELECTRICAL CHARACTERISTICS (continued)
(BAT = +6V to +26V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V, TA = +25°C.) (Note 2)
PARAMETER LINEAR REGULATOR Output Voltage VLO MAX13037, VBAT = +14V, ILOAD = 1mA MAX13038, VBAT = +14V, ILOAD = 1mA ILOAD = 1mA to 50mA, VBAT = +14V Load Regulation LOAD_REG ILOAD = 1mA to 150mA, VBAT = +14V Line Regulation Dropout Voltage Output Current Limit Power-Supply Rejection Ratio Start-Up Time RESET, WATCHDOG Reset Reference Voltage THERMAL SHUTDOWN Thermal Shutdown Temperature Thermal Shutdown Temperature for Wetting Currents Only Thermal Shutdown Hysteresis TSHDN TWARN THYST (Note 6) (Note 7) 165 135 15 °C °C °C VRST THRESH from high to low 1.20 1.24 1.28 V LINE_REG VBAT = +6V to +26V VLO = +5V, ILO = 50mA (MAX13037) VDROP ILIM PSRR tSTART VLO = +5V, ILO = 150mA (MAX13037) VLO = +3.3V, ILO = 150mA (MAX13038) VBAT = +14V ILO = 10mA, f = 100Hz, 500mVP-P, AC-coupled into VBAT 150 68 1 VLO = +5V (MAX13037) VLO = +3.3V (MAX13038) VLO = +5V (MAX13037) VLO = +3.3V (MAX13038) -0.9 4.92 3.234 5.00 3.300 0.53 0.53 1 1 5.08 3.366 1 1 % 1.85 1.85 +0.9 330 1000 1300 mA dB ms mV mV/V V SYMBOL CONDITIONS MIN TYP MAX UNITS
TIMING CHARACTERISTICS
(BAT = +6V to +26V, TA = -40°C to +125°C, unless otherwise noted. Typical value
